如何使用 C++ 来计算 OpenCV 中识别的面部数量?
计算图像中的面部数量很容易。我们在上一节中编写的程序已经具有“faces.size()”中的人脸数量的信息。此代码-“faces.size()”赋予了一个整数值。
例如,如果我们写“int x = faces.size()”,则“x”将包含人脸的数量。
以下程序从给定的图像中计算出人脸数量并将其显示在控制台窗口中。
示例
#include<iostream>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/objdetect/objdetect.hpp>
//This header includes the definition of Cascade Classifier//
#include<string>
using namespace std;
using namespace cv;
int main(int argc, char** argv){
Mat image_with_humanface;//Declaring a matrix to load image with human faces//
image_with_humanface = imread("friends.jpg");//loading an image that contains human face in it//
string trained_classifier_location = "C:/opencv/sources/data/haarcascades/haarcascade_frontalface_alt.xml";//Defining the location our XML Trained Classifier in a string//
CascadeClassifier faceDetector;//Declaring an object named 'face detector' of CascadeClassifier class//
faceDetector.load(trained_classifier_location);//loading the XML trained classifier in the object//
vector<Rect>faces;//Declaring a rectangular vector named faces//
faceDetector.detectMultiScale(image_with_humanface, faces, 1.1, 4, CASCADE_SCALE_IMAGE, Size(20, 20));//Detecting the faces in 'image_with_humanfaces' matrix//
int x = faces.size();//Calculating the number of faces and storing the integer value in x//
cout << "Number of face(s)in the image=" << x << endl;//Displaying the value of x in the console window//
system("pause");//Pausing the system to visualize the result//
return 0;
}输出

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